Network communication method and apparatus

Abstract

This application provides a communication method and a communications apparatus. The method can include performing extension based on an existing operation, administration, and maintenance (OAM) packet after an intermediate node in a path of a segment routing traffic engineering (SR-TE) tunnel senses a bit error fault, to support a bit error switching function. That is, the method can include adding, to the OAM packet, identification information used to identify that signal degradation occurs in the SR-TE tunnel. As a result, it is ensured that the SR-TE tunnel supports the bit error switching function of the intermediate node, and a customer service can be effectively prevented from being damaged.

What is claimed is: 
     
       1. An intermediate node, comprising:
 a memory comprising instructions; and 
 a processor coupled with the memory, the instructions when executed by the processor cause the intermediate node to:
 receive, using a segment routing traffic engineering (SR-TE) working tunnel, a first operation, administration and maintenance (OAM) packet from a first provider edge (PE) node; 
 encapsulate identification information in the first OAM packet to obtain a second OAM packet, wherein the identification information identifies that signal degradation (SD) occurs in the working SR-TE tunnel, wherein the second OAM packet is a continuity check message (CCM), wherein the intermediate node is between the first PE node and a second PE node on the working SR-TE tunnel, and the first PE node is an ingress node of the working SR-TE tunnel, the second PE node is an egress node of the working SR-TE tunnel; and 
 send the second OAM packet to the second PE node using the working SR-TE tunnel. 
 
 
     
     
       2. The intermediate node according to  claim 1 , wherein the identification information is carried in a flag field in the CCM. 
     
     
       3. The intermediate node according to  claim 1 , wherein the identification information is carried in a reserved field in the CCM. 
     
     
       4. The intermediate node according to  claim 1 , wherein the instructions when executed by the processor further cause the intermediate node to:
 before obtaining the second OAM packet, determine that a port bit error fault occurs on the intermediate node. 
 
     
     
       5. A communications system, comprising:
 a first provider edge (PE) node; 
 an intermediate node; and 
 a second PE node, wherein the first PE node is connected to the second PE node by using a working segment routing traffic engineering (SR-TE) tunnel, and a path of the working SR-TE tunnel comprises the first PE node, the intermediate node, and the second PE node, wherein 
 the first PE node is configured to:
 send a first operation, administration, and maintenance OAM packet (OAM) packet using the working SR-TE tunnel; 
 
 the intermediate node is configured to:
 receive, using the working SR-TE tunnel, the first OAM packet sent by the first PE node, 
 
 encapsulate identification information in the first OAM packet to obtain a second OAM packet, wherein the identification information identifies that signal degradation (SD) occurs in the working SR-TE tunnel, wherein the second OAM packet is a continuity check message (CCM); and 
 the second PE node is configured to:
 receive, using the working SR-TE tunnel, the second OAM packet, 
 determine, based on the identification information, that the SD occurs in the working SR-TE tunnel. 
 
 
     
     
       6. The system according to  claim 5 , wherein the identification information is carried in a flag field in the CCM. 
     
     
       7. The system according to  claim 5 , wherein the identification information is carried in a reserved field in the CCM. 
     
     
       8. The system according to  claim 5 , wherein the second PE node is connected to first PE node by using a protection SR-TE tunnel, the second PE node is further configure to:
 on determining the SD occurs in the working SR-TE tunnel, switch from the working SR-TE tunnel to the protection SR-TE tunnel. 
 
     
     
       9. The system according to  claim 8 , wherein the second PE is further configured to:
 send, by using the protection SR-TE tunnel, an automatic protection switching (APS) packet to the first PE node after the second PE node switching to the protection SR-TE tunnel, wherein the APS packet instructs the first PE node to switch to the protection SR-TE tunnel. 
 
     
     
       10. The system according to  claim 9 , wherein the first PE node is further configured to:
 switch from the working SR-TE tunnel to the protection SR-TE tunnel. 
 
     
     
       11. A communication method, implemented by an intermediate node, comprising:
 receiving, using a segment routing traffic engineering (SR-TE) working tunnel, a first operation, administration and maintenance (OAM) packet from a first provider edge (PE) node; 
 encapsulating identification information in the first OAM packet to obtain a second OAM packet, wherein the identification information identifies that signal degradation (SD) occurs in the working SR-TE tunnel, wherein the second OAM packet is a continuity check message (CCM), wherein the intermediate node is between the first PE node and a second PE node on the working SR-TE tunnel, and the first PE node is an ingress node of the working SR-TE tunnel, the second PE node is an egress node of the working SR-TE tunnel; and 
 sending the second OAM packet to the second PE node using the working SR-TE tunnel. 
 
     
     
       12. The method according to  claim 11 , wherein the identification information is carried in a flag field in the CCM. 
     
     
       13. The method according to  claim 11 , the identification information is carried in a reserved field in the CCM. 
     
     
       14. The method according to  claim 11 , wherein the method further comprises:
 before obtaining the second OAM packet, determining that a port bit error fault occurs on the intermediate node.